Database Develop

Wifi Standby Policy

I was playing around with the Wi-Fi sleep policy settings and I am little bit confused how it really works.
The default setting is something like: "turn off wifi when screen is turned off".
So as I understand it it should disable wifi when the screen is turned off.
However when I checked my device list at my router it seemed that my n1 was still connected through wif, even after the screen was turned off. Only after 5-10 minutes wifi was really disconnected (when I turned on the screen again the wifi symbol in the top bar appeared after some seconds). I read somewhere that there is a difference between disabling wifi and disconnecting wifi?
BTW. the wifi sleep policy is supposed to save battery because it is said that 3G in idle mode requires less power than a wifi connection, but I read that with the nexus one the opposite is true. so what's the truth?

It's normal for the wifi to disconnect after several minutes of inactivity once the screen turns off. As for your very last question, I don't know... but I imagine that idle 3G is less power intensive than active wifi, otherwise it wouldn't be the default option...

[Q] WiFi Battery Drain

Alright I hate to ask this question, but my searching and reading is not leading anywhere. I recently upgraded to GB (Illuminance with Corn) and I'm loving how fast my phone is. The only problem I notice is how fast my battery drains while on WiFi (Wireless N with WPA2).
Example: I was at my parents house for 2.5 hours, but didn't bother turning wifi on. I only lost a few %. Once I got home, I kicked on the wifi and within an hour I lost 20%. It appears that when wifi is turned on it is almost constantly in use. I checked for rogue apps and data usage and found nothing. The only thing I notice is that every 5 seconds (yes, I actually timed it) it is polling for new networks.
After doing some reading I checked and the build.prop mods are in there (wifi.supplicant_scan_interval).
Any suggestions on where to go next?
Recap of phone config:
Rom: Illuminance 3.01
Kernel: Corn 7.06
Modem: KK4

Yeah...I've noticed that the build.prop tweaks for wifi scanning don't actually seem to change the scanning interval on gingerbread ;/
Try going to, Settings> wireless and networks> wifi settings> menu button> advanced> set wifi sleep policy to "when the screen turns off"
That'll help while it's asleep.

studacris said:
Settings> wireless and networks> wifi settings> menu button> advanced> set wifi sleep policy to "when the screen turns off"
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+1
I switched my ROM from Apex to Illuminance to test a theory that this functionality would work as it had in the past on Apex ROMS. For whatever reason kernels/framework were swapped in a newer version of Apex that killed this very helpful functionality. Once I switched to Illuminance and enabled the functionality, it works again and I get 2+ days worth of battery life with moderate usage (rarely a video/music played, but I do a lot of browsing and email usage/fb/twitter usage is high).
It drove me nuts on Apex trying to figure out the issue. I had thought my settings.db files that control the wifi functions had gone corrupt and the dev ignored any requests for assistance.
Glad I made the switch.

studacris said:
Yeah...I've noticed that the build.prop tweaks for wifi scanning don't actually seem to change the scanning interval on gingerbread ;/
Try going to, Settings> wireless and networks> wifi settings> menu button> advanced> set wifi sleep policy to "when the screen turns off"
That'll help while it's asleep.
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Click to collapse
That was the first thing I noticed. The ROM defaulted to Always On. I changed that the first day. Unfortunately, I still have the issue. As it stands, I only get one day at most out of my charge. The only thing I let sync is the gmail account. I mostly browse and talk less than 1 hour per day.
I'll try to do a more statistical approach when I get a chance. I'll see about taking readings ever half hour with the wifi on and no other use.

I was under the impression that if the phone downloads data over WiFi it actually uses less battery than if it downloaded data over 3G. When I'm at home, I leave my WiFi on intentionally when my phone is asleep so that my incoming email is more efficient since I have WiFi available.
Am I wrong here? Just curious if I've been mislead all this time.

I don't think you're wrong. That is why I always use wifi at home. I think I found some errant scripts that were running and causing the excess battery drain. I have taken those off.
I'll probably master clear and reload when I'm no longer on call this weekend just to make sure I got everything.

[Q] Wifi never goes off in sleep mode

I have a strange problem. I set the 'Keep Wi-Fi on during sleep" to "Only when plugged in" but I see that Wi-Fi stays always on, also during sleep. In addition I noticed that the largest battery consumer is Android OS. Any ideas what's wrong?

amarguli said:
I have a strange problem. I set the 'Keep Wi-Fi on during sleep" to "Only when plugged in" but I see that Wi-Fi stays always on, also during sleep. In addition I noticed that the largest battery consumer is Android OS. Any ideas what's wrong?
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Under Wifi Advanced Settings, you probably have the option for "Scanning always available" enabled. This keeps wifi available for location services, and makes it look like it's always on to the power monitor.

No. It is disabled

amarguli said:
No. It is disabled
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Your battery usage doesn't look off. Android OS is almost always the biggest battery consumer on mine unless I'm using the phone heavily. wifi is typically 3-4.
I easily get through a day on a single charge. Usually I've got between 20-40% left at night depending on usage.
As for wifi I don't know. Perhaps there is another app keeping it on. I would try turning all location services off and see if that changes anything.
I'm curious why you'd want wifi off. generally it will default to the mobile signal which will use a lot more power. only reason to turn wifi off is if you don't have access to it.

Wi-Fi deactivation bug

Hi,
I have found a bug with Wi-Fi, you can monitor it with the help of this battery menu ( see screenshot ).
So, basically if you turn Wi-Fi on, then off, Wi-Fi won't deactivate. It will be deactivated only after a reboot or after activating/deactivating airplane mode.
How to monitor:
Activate Wi-Fi, deactivate it and then wait at list half an hour. Then go in the same battery menu than screenshot and you will see Wi-Fi is still activated ( solid blue bar).
Now deactivate Wi-Fi and briefly activate/deactivate airplane mode. Wait half an hour then go again in the same menu than screenshot : Wi-Fi is really deactivated.

Tried disabling "Scanning always available" in the Advanced WIFI setting?
I think it has to do it
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wifi shuts off when phone sleeps?

everytime when i charge my the phone, my wifi is turned off. I have to turn it back on, but it works fine. just wondering if there's a setting to leave it on.

Yeah it's in the advanced wifi settings. This is a setting that has been around on Android for a while.

check wifi control history, maybe there is some app that switches it off? Works fine on mine, are you using power saving mode?

pete4k said:
check wifi control history, maybe there is some app that switches it off? Works fine on mine, are you using power saving mode?
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i already checked the wifi always on in advanced wifi settings. there are no apps listed in wifi control history. and no on power saving mode.

any other suggestions? im pretty sure it's a setting related problem, but all the setting mentioned I checked. the always wifi is on, nothing in wifi control history